Process design and production of boron trichloride from native boron carbide in lab-scale

Duygu Agaogullari*, I. Duman

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Turkiye owns the biggest boron mine reserves of the world, so it is a necessity to research the possibilities of obtaining high-tech products of boron. This study is oriented to provide one of two main inputs, boron trichloride (BCl3) gas and carbon/tungsten core, for production of boron fiber manufactured by well-hidden hot filament CVD method. In this study, the production of BCl3 from native boron carbide (B4C) was aimed. In the production process, two different originally designed set-ups were used. In the set-ups, the reaction occurred by passing chlorine gas (Cl2) through B4C layer (10-110 g) which has different heap heights. The reactor was a vertical quartz tube heated up to 850°C by a tube furnace with silicon carbide (SiC) heating element. Chlorine as reaction gas and nitrogen as purging gas were dried in two different columns with calcium chloride (CaCl2) and molecular sieve package. Flow rates of Cl 2, pressure and temperature changes in the set-ups were controlled respectively by rotameter, mass-flow controller (MFC), mercury U-tube manometer, thermocouple and thermometers which were placed in different zones. The product gases were separated in consecutive distillation columns and waste gases were conveyed to a rashing ring packaged gas scrubber. In pipelines, traps and condensers, various metal (i.e. Fe, Al, W, Si, and Cr) halides depending on the impurities of B4C were detected in different phases. The products in form of gas, liquid and solid were analyzed with FTIR, AAS, XRD and SEM/EDS. Production efficiencies (up to 85 %) and consumption rate of Cl2 (up to 91 %) were assigned.

Original languageEnglish
Title of host publicationProcessing and Properties of Advanced Ceramics and Composites- A Collection of Papers Presented at the 2008 Materials Science and Technology Conference, MS and T'08
Pages77-90
Number of pages14
Publication statusPublished - 2009
Event2008 Materials Science and Technology 2008 Conference , MS and T'08 - Pittsburgh, PA, United States
Duration: 5 Oct 20089 Oct 2008

Publication series

NameCeramic Transactions
Volume203
ISSN (Print)1042-1122

Conference

Conference2008 Materials Science and Technology 2008 Conference , MS and T'08
Country/TerritoryUnited States
CityPittsburgh, PA
Period5/10/089/10/08

Keywords

  • Boron carbide
  • Boron trichloride
  • Chlorine
  • FTIR
  • Vertical tube furnace

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